Burner for blow torches and the like



July 25, 1933. H. M. HUFFMAN BURNER FOR BLOW TORCHES AND THE LIKE FiledJan. 5, 1931 //V VE/VTOR HORACE IV. HUFFMAM v Patented Ja1yl 'g5,i1 3

ff, Home "Brianna FOR eowe a aasnaame LIKE l invention relates toburnersfoifiblow "cups-is open. to various"objections. Foij eX-:

torches and thelike: and more particularly to "means ior preheating sucha aburnerto initiate the" operation thereof; The burner of" a; blowtorch as usually constructed, comprises a' flamew tube which isconnected by a conduit with atank 'containing liquid fuel under "air,pressure-,a,the delivery of the fuelfromthe tank to the flame tubebeing controlled by a valve at'the rear endof the flame tube. a The fuelconduit "is so arranged with relation. to the flame tube that when theburner-is in op'eration the. heat therefrom will heat the: fliel -in theconduit? and vaporize the same -butin'j'order to initiate the'operationofthe' burner it has been customary to support a l drip cup- .beneaththe burner'and to deliverliquid fuel: to that drip cup and therejignitethe same: Thear'npl e, f it not infrequently happens that'jtheagain fill; the drip cup andigriite'the fuel of fuel y no h v shee thbPm ZS' lfi cientlyto initiate its" operationit Ewillfn' vertheless haveiheatedfthe; flame a to such .an extent thatlthe'operator' -cannotlagainhe must findxsome" other-means for; closing the end oftheflame tube:Under rmany con-j ditions of operationno: such": means is availv ienceis occasionedwhenj'theburning of the first cupoffuel failsto set theburner :in

operation;- Further -i fgtheoperator wears a glove on the handwhichcloses'theflamej" tubethat glovebecomessaturatedwithzfuel 1 In theaccompanying drawing Fig.-

. 1 In th l'drawing'I burning of the fuel inthe drip cup will notsufliciently heat "the burner to initiate operation "thereof; a and itisf 'neoessary to therein; While the burning of the firstcup',

place his" hand" against the end thereof,[ a;iid in order ;to fill thedrip-cupthe seeondltime able and; much loss offtime 'and inconven'g"Application a e try-@1931; seiiai No. 506,675.1f

and there is serious danger of itsbeing ig-= nitedf by the flame fromthe drip cup. One object of the-present invention isto, "provide aburner of thiskind 7 having im proved means for filling the drip jcupwhich will beffree from the fobjections to the pres ent burner.;-:j

Al-further object the invention Y provide a burner -with means forfillinglthe dripcupwhich will be verysimp'le in its construction andoperation and which can be embodied in the burnerat a very low'cost.

{Qther objects ofthe' invention will appear as the device is describedin detail.

side elevation of a burner embodying my invention, showing theflametub'e-and conduit insection; Fig;- 2is a side elevation, partly M,3mm, astr ngen -urg tassrenon zro 'ntir'rirn'n; MANUFhc'rnn- Vmeoonrany, orinmrron, onro, eponronarro t oronro 4 in eeapmo a slightlymodified form-of burner; Fig. 3 isa side elevationypartly in section, ofafurther modification of the inventi'o'n'; Fig. 4 is' aside elevation,partly in section, of'a portion of a burner illustra't ing anotherembodiment io'r the invention and Fig. 5;is"a section'taken' onthe'line,

5 5 of, Fig. 1

mentsihave been chosen for the purposes 'of p have illustrated certain,embodiments of the-invention but it will be c understoodthatthese'particular embodi u I illustrationonly, andthat' theinventionmay 'lustrated in Fig. l the'preheating device -is'takevarious" forms and may be appliedfto applied to aqWell known typeofburner head.

' inwhiehthe burner proper is in the-form of flame tube 5 a'nd-isconnected-with a-source .of fuel supply by a;vein tube or fuel00ndu'itfformed in the burner head and having-a horizontal portion6jand'an upright portion 7-, the latter portion communicating with theflame; tube" through an inlet port 8, which is 7 shaped to form a valveseatiwith which c0;- operates a -needle valve 9 havingj-an operat-..iiig handle or hand wheel 10; The horizon talportionifiofftheconduitisconnectedwith i a tubular-I fitting 11 which; forms {a partzofthefuelconduit andis attached to and com- V municates with afueltank l2and which, in

the present instance, forms a support forthe burner head or structure.The fuel tank 12 is usually provided with" anair pump 13 to subjectthe-fuel therein to :airipressure. Ar-

ranged beneath the burner and, preferably mounted on the tubular fitting11, isfadrip cup 14.1 The conduit which deliversthe fuel fromjthe tanlr12 to the flame tube is pro-- vided in advance ofthe valve 9 with avalvecontrolled passageway or supplemental con; duit through which fuel mayibe delivered from the conduit to the drip cup. Thisipae i sageway-maytake various "forms and inay be arranged in various positions but, asshown:

in Fig. 1, the main fuel conduitis formed in the burner structure, or,head and the burner head is provided with airearwardly extendingpartorbosslfl-having a longitudinal bore or, conduitf16 arrangedinline withthehorizontal portion 6 of themain conduit,-= having an outlet-17directed, toward the fuel cup 14 and'constituting a supplementalf'uelxconduit. The bore 16 of the supplemental conduit is providedbetween V the OutletUl-T; and the; main conduit witha valve seatlSwliich is engaged bya valve 19.- As hereishown, the valve 19' is'carried by a stem 20 having screw threaded engagement with the rearportion of the boss Qand is provided with an operating handle or knob21. To fillthe drip cup it'is only necessary to seefthat the valve 9 isclosed and to'then open the valve 19 to per nitthe fuel to flow from themain conduit through the a supple mental conduit. and its outlet intothe drip cupgjVVhen thedrip cup has been filled the supplemental valveis closed and the fuel ig nited. vWhen the burner has been heatedthemain valve 9 :is' gradually opened toipermit the fuel to entertheflame tube from the main conduit, where fit is ignited. Prefer ably; theboreflG' 0f ifl18 supplemental cone 3 duit is connected with themainzconduitbyl an orifice 22 .of small capacity sothat the? fuel willbedelivered-to theoutlet 1 7.forv

thesupple nental conduit at a lowered pres:

surewhichwillprevent the splashing of the 1 fuel from the drip cupFurther, the pres-t. sure on the fuel within thesupplemental con-.

oluityis reducedto such an extent that there is little likelihood fleakage; about Qthe' threaded valve stem 20, thus avoiding ,the nece itya p n l nd a a fpe It will be understood, however, that there? strioted:orifice between the supplemental conduit and the main conduit is not,essen tiallto the operation of the device. [When the'burner head isarranged in an inclined position as shown. in Fig.1, it is desirable.that: it should; be PIT-()Vided with a hollow boss surrounding theoutletopeningnfrom the vconduit and; forming a continuation ofl hewjo t, t prve he iq i .fr mfiow ing rearwardly- 'alongthe outside of 'theQpart .1to'fth burner head-11: Ali a In the arrangement, is much the same asthat shownin Fig. 1 but the supplemental conduitis formed in a separatepart,

thus making it possible to apply the inventionto a burner of the presenttype without substantial change in the construction thereof. As thereshown, the'supplem'ental conduit is formed in atubular member 23 havingatits forward end a threadedprojection ,24tiiadapted to rbe "screwedinto a threaded opening at the rear "end of th'e horizontal portion .6of the main conduit. In some burners lthis 'horizontal portion of theconiduit isxbored from the rear end of the burner structure and the rearend thereof closed by a'pluglf Inisuch a caserthe plug may be re-.movedand the" tubular ,member 23 substi tutedf therefor; JIf the mainconduit was not bored throughthe'rear. end, of the burner structure itis only nece'ssaryto provide a threaded openingu'at this, point; Thesupplemental conduit in the tubular member 23 is similar to that shownin Fig. 1 and isoconnected withtlie'mainconduit by a restricted orifice25 and has an outletl26 arranged above the drip cupld. 'A valve 27engages a 'valveseati at the rear end of the restricted orifice '25tolcontrolthe flow of fuel to the outlet and this valve is, carried bystem 28which is-screw threaded into the rear end ofthe tubularzmemberand operatinghandlef29.

. In'- Fig. 3 eave shown the-invention a appliedto a burner of aslightly different through'which the jf fuel may; enter the lflametube." In this construction the burner i "structure 1 extends rearwardlyto such a point that itis' notzfeasible to further extend the same forthe purpose, of providing a supple mental "conduit; I have thereforeprovided thelower part of the structure with an enlargementBG, arrangedbelow the horizontal portion 30fof the main conduitfand-have formed thesupplemental conduit 37 iuthis enlarged portion ofthe structure." Theforward end of the supplemental c'onduitis conv nected by a restrictedorifice 38 with-a passageway 39 leading to the main conduit.Thesuppleniental conduit also has-an outlet 40 directed toward'the fuelcu 14: and: has

between the outlet '40. and the orifice 38 a which is carried by a] stem42 extending rearwardly beyond the; burner structure.

L That embqdimen of the, v es d n provided with an 7 valve seat which is'enga'gedby a valve 41 secure by'Letters Patent, is: ,o

1. In a blow torch, a burner head hav-' in Figs. .4 and '5 is applied toa burner v similar to that shown in Fig.- 3 and the supplemental conduitcomprises an inclined pas-' sageway 43 formed in the burner structure,

communicating with the-main fuel conduit near the upper end of thetubular member 11 and having its outerend arranged-to discharge into thedrip cup 14;. ,A valve 44 controls the flow of fuel through thesupplemental conduit or passageway.-

While I have shownand described certain embodiments of my invention Iwish it to bev understood that I do not "desire to be limited to thedetails thereof as various modifications may occur to a person skilledin the art.

Having now fully described my in'ven tion, what I claim as new :anddesireto ing a flame 2, a main conduit to connect said flame tube with asource of supply for fuel 'under" pressure, a supplemental conduithaving a downwardly directed outlet, and an orifice connecting saidsupplemental conduit with'said main conduit, said orifice being of lesscapacitythan said outlet, a valve to control the 1 flow of fuel throughsaid orifice, a drip cup arranged beneath said outlet to receive fueltherefrom, and a valve to controlthe delivery offuel fromsaid mainconduit to said flame tube.

2. In a blow torch, aburner head having a flame tube, a main conduit toconnect said flame tube with asource of supply of fuel under pressure, asupplemental conlengthwise of said burner head and com an'orificeconnecting saidsupplemental conduit with said main conduit, said orificebeing of less capacity than said outlet, and i a valve seat interposedbetween said orifice duitghaving a downwardly directed/outlet,

and said outlet, said burner head also havmember connected with'saidstem and mov-" able thereby into and out of engagement with said valveseat,= a drip cup supported i beneath} said outlet to receive fueltherefrom, and a valve to control the delivery of fuelfrom said. mainconduit to said flame tube." v

3. In 'a blow torch, a burner head having a flame tube,'a main. conduitextending municating'with a source of supply for fuel under pressure,valve controlled means to connect said conduit with said flame tube, asupplemental conduit substantially in line "withsaid main conduit andhaving a downwardly directed outlet, an orifice connecting said mainconduit-with said supplemental.

conduit, and a valve seat at that end ofsaid orifice; adjacent to said,supplemental ,conduit,.said orifice "being of less capacity than ng ascrewthreaded opening. leading to 3 said supplemental conduit, a screw.threaded valvestem mounted in said opening, a valve

